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Commit 34af1913 authored by Alexander Usyskin's avatar Alexander Usyskin Committed by Greg Kroah-Hartman
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mei: keep the device awake during reads in chunks 



Long messages are read in chunks, to prevent trashing runtime pm between
the reading of the chunks we call pm_runtime_mark_last_busy() on
non-final chunk message as the next chunk of the same message will be
received immediately in the next interrupt with high probablity.

Signed-off-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 97ccf63f

drivers/misc/mei/interrupt.c

+4 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/fs.h>

#include <linux/jiffies.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>



#include <linux/mei.h>
@@ -147,6 +148,9 @@ int mei_cl_irq_read_msg(struct mei_cl *cl, 
		cb->read_time = jiffies;

		cl_dbg(dev, cl, "completed read length = %lu\n", cb->buf_idx);

		list_move_tail(&cb->list, &complete_list->list);

	} else {

		pm_runtime_mark_last_busy(dev->dev);

		pm_request_autosuspend(dev->dev);

	}



out: